can't load Kepler.gl JSON without data

1) load demo earthquakes dataset
http://localhost:8080/#/demo/earthquakes
2) click export and export Kepler.gl JSON according to https://github.com/uber/kepler.gl/blob/master/docs/k-save-and-export.md however, without data
3) reload page to http://localhost:8080
4) upload kepler.gl JSON configuration file.

Step 4 hangs for me forever when no data is included (only configuration is loaded).
When data is included it works just fine.

An sample kepler.gl JSON configuration file for earthquakes can also be found at https://gist.github.com/geoHeil/fa5898318822829efc144501e49ab163

Start at the JSON configuration upload flow described in step 4 and compare it with the path used when data is included. Reproduce the issue with the linked earthquakes configuration and confirm whether the no-data upload completes; done means the configuration loads without hanging while the data-included case remains working.

Written by the indexing model from the issue text.